SEOLumina and SellerSpy are the two most-discussed keyword research tools built specifically for Teachers Pay Teachers sellers. They overlap in some areas, but their feature depth, data approach, and pricing structure are different enough that choosing the wrong one means you're either paying for gaps or missing data that would change your keyword decisions. This guide breaks down exactly what each tool offers — feature by feature, tier by tier — so you can pick the one that fits your store.
If you want the honest answer first: SEOLumina looks better for sellers who want deeper keyword evaluation, competitor analysis, store optimization, and product validation in one workflow. SellerSpy looks better for sellers who want a lighter, narrower TPT SEO tool with rank tracking and title-focused helpers. That conclusion is based on what each platform publicly emphasizes right now, not on assumptions about hidden features or undocumented claims.
The short verdict
Choose SEOLumina if you want a broader TPT SEO workflow with keyword research, keyword difficulty signals, opportunity scoring, competitor product analysis, store auditing, sales estimation, and seasonal planning. SEOLumina publicly positions itself as a multi-tool optimization platform for Teachers Pay Teachers sellers, and its pricing page clearly shows these tools and limits.
Choose SellerSpy if you want a more focused toolset centered on TPT keyword research, title analysis, product rankings, keyword lists, and a simpler SEO workflow. SellerSpy’s public pages and search snippets consistently highlight Title Analyzer, Product Rankings, Keyword Lists, Keyword Insights, Store Audit, Keyword Trends, and Title Brainstorm.
So this is not a “good tool vs bad tool” comparison. It is a comparison of depth vs simplicity.
What each platform publicly claims to do
SEOLumina
SEOLumina’s public products page presents it as a TPT SEO platform with these core tools:
- Keyword Generator
- Keyword Explorer
- Store Audit
- Sales Estimator
- Product Explorer
- Seasonal Keywords
- Product Creation
Its messaging focuses on helping TPT sellers find keywords, analyze competitors, optimize listings, validate market demand, and grow sales. It explicitly highlights features such as difficulty ratings, product quality scores, estimated sales, market saturation metrics, and seasonal trend planning.
SellerSpy
SellerSpy’s public homepage snippet describes it as a TPT SEO tool that helps sellers optimize listings with keyword research, suggestions, and other insights. Public search results also show it highlighting:
- Title Analyzer
- Product Rankings / My Product Rankings
- Keyword Lists
- Keyword Insights
- Store Audit
- Keyword Trends
- Title Brainstorm
That is enough to say SellerSpy is clearly positioned around keyword research, title improvement, and ranking-related utility, even though its public text is less detailed in the search-accessible pages than SEOLumina’s.
The biggest difference: keyword ideas vs keyword decisions
This is the core of the comparison.
Many TPT sellers do not struggle to find keyword ideas. They struggle to decide which keywords are worth building around. A tool can generate hundreds of suggestions and still leave you with the hard part: choosing the right target.
SEOLumina’s public pages put much more emphasis on that decision layer. Its Keyword Generator page says it pulls TPT autocomplete suggestions, estimates popularity, checks competition, and scores difficulty so sellers can choose keywords with the best chance to rank and sell. Its products and pricing pages also make “Difficulty & Opportunity scores” a visible part of the paid plans.
SellerSpy, by contrast, publicly highlights keyword research, title analysis, rankings, and keyword insights, but its accessible public snippets do not show a comparable keyword difficulty or opportunity scoring framework. Based on the current public pages, it appears more focused on helping sellers research and optimize than on surfacing a deeper scoring model for keyword selection.
That does not automatically make SellerSpy weak. It just means SEOLumina appears more built for sellers who want help answering, “Can I realistically win this keyword?” rather than only, “What are some relevant keywords?”
Quick Summary
- Choose SEOLumina if you want Keyword Difficulty scores (1–99), Opportunity Scores (0–100), competitor product analysis, sales estimation, seasonal keyword planning, and a full store audit — all in one platform. Free tier available. Paid plans start at $12.99/mo.
- Choose SellerSpy if you want a simple keyword generator with a Title Analyzer, Keyword Insights, and a Product Rank checker. Strong free tier for basic keyword searches. Paid plans start at $14.99/mo.
What Each Tool Actually Includes
SellerSpy — Overview
SellerSpy was built by Colleen Swanzey, a TPT seller. The platform focuses on keyword research, title optimization, and product ranking checks. It offers three tiers: Free, Pro ($14.99/mo), and Premium ($24.99/mo).
The free account gives you 5 keyword searches per day in the Keyword Generator — a genuinely useful starting point for any seller. Upgrading to Pro unlocks the Keyword Explorer (300k+ keyword database), Title Analyzer, 5 Product Rankings, 5 Keyword Lists, and Keyword Insights. The Premium tier adds Store Audit, Keyword Trends, Title Brainstorm, and removes the daily limits on Product Rankings and Keyword Lists.
SellerSpy strengths
- Free keyword generator — zero-cost entry point
- Title Analyzer with keyword suggestions (Pro+)
- Product Rankings shows where your listing appears
- Keyword Lists for saving research (Pro+)
- Store Audit on Premium tier
- Title Brainstorm for ideation (Premium)
- Keyword Trends for spotting shifts (Premium)
- Built by a TPT seller — understands the community
SellerSpy limitations
- No Keyword Difficulty score (1–99 scale)
- No Opportunity Score
- No product-level competitor quality analysis
- No sales/revenue estimation
- No seasonal keyword planning tool
- Store Audit and Trends locked behind $24.99/mo tier
- Pro tier limits: 5 Product Rankings, 5 Keyword Lists
- No free access to Keyword Explorer, Title Analyzer, or Insights
SEOLumina — Overview
SEOLumina is a broader TPT SEO platform with seven tools. It offers four tiers: Free, Starter ($12.99/mo), Standard ($24.99/mo), and Advanced ($49.99/mo). Annual billing drops prices by ~17%.
The free tier gives you 10 keyword generator searches per day, plus limited access to Product Explorer, Keyword Explorer, and Sales Estimator. All paid plans unlock the full toolset including Keyword Difficulty scores, Opportunity Scores, and Product Quality metrics — the tiers only differ in daily query limits. That means a $12.99/mo Starter user gets the same analytical depth as an Advanced user — just with lower volume caps.
SEOLumina strengths
- Keyword Difficulty score (1–99) quantifies real competition
- Opportunity Score (0–100) combines demand + competition + potential
- Product Quality scores (0–100) for competitor listings
- Sales Estimator validates niche demand before you create
- Seasonal Keywords for calendar-based planning
- Store Audit scores every listing with prioritized fixes
- Product Creation tool — test title/description before publishing
- All paid tiers include all features (differ only in limits)
- Free tier with 10 searches/day
- 450,000+ keywords and 3.5M+ products in database
- Annual billing option saves ~17%
SEOLumina limitations
- More tools = steeper initial learning curve
- Newer platform — smaller community and less blog coverage
- No dedicated Product Rank tracker (yet)
- Free tier excludes Difficulty/Opportunity scores and Seasonal Keywords
Feature-by-Feature Comparison Table
Here's every meaningful feature side by side. Green checks, red crosses, no spin.
The table reveals two different philosophies. SellerSpy gates features by tier — free users only get keyword generation, Pro users unlock the core tools, and Premium unlocks everything including Store Audit and Trends. SEOLumina gates by volume — all paid users get every tool and every metric, with higher tiers simply raising the daily query limit.
What this means in practice: A SellerSpy Pro user ($14.99/mo) cannot access Store Audit, Keyword Trends, or Title Brainstorm — those require Premium ($24.99/mo). A SEOLumina Starter user ($12.99/mo) gets Store Audit, Seasonal Keywords, Keyword Difficulty, Opportunity Scores, and Product Quality scores from day one — just with lower daily limits.
The Keyword Difficulty Gap: Why This Is the Biggest Difference
This single feature is the primary reason sellers switch from SellerSpy to SEOLumina, so it deserves its own section.
When SellerSpy shows you a keyword, it provides a popularity score and a general sense of competition. This tells you roughly how many products exist — but not how strong those products are. A keyword with 3,000 competing products could be easy to rank for if the top listings have weak covers, few reviews, and thin descriptions. Or it could be impossible if the first page is dominated by established sellers with 500+ reviews and optimized thumbnails.
SEOLumina's Keyword Difficulty score (1–99) accounts for both quantity and quality of competition. It evaluates not just how many products target a keyword, but the strength of those products — reviews, ratings, listing completeness, preview quality, and keyword optimization. A score of 15 means a new product has a realistic shot at page one. A score of 75 means the top spots are locked down.
The Opportunity Score goes further by combining difficulty with demand. A keyword with difficulty 10 but near-zero search volume isn't useful. A keyword with difficulty 20 and strong demand is gold. The Opportunity Score surfaces exactly those opportunities.
Real-world impact: Multiple TPT seller blog reviews mention that even when using SellerSpy, they still manually search each keyword on TPT to assess competition — because the built-in competitiveness data isn't granular enough for confident decisions. SEOLumina's Keyword Difficulty score is designed to replace that manual verification step entirely.
Pricing Comparison: Tier by Tier
Here's what each dollar actually buys you.
The pricing math becomes interesting at the mid-tier. SellerSpy's Pro ($14.99/mo) gives you unlimited keyword generation and Explorer access, plus a Title Analyzer — but no Store Audit, no Trends, and no Difficulty scores. SEOLumina's Starter ($12.99/mo) costs $2 less and includes Keyword Difficulty, Opportunity Scores, Product Explorer, Sales Estimator, Seasonal Keywords, and Store Audit. The trade-off: SEOLumina Starter has daily limits (50 KW gen/day) while SellerSpy Pro is unlimited on generation.
At $24.99/mo, both platforms offer their "full" experience. SellerSpy Premium unlocks every feature including Store Audit and Trends. SEOLumina Standard doubles the Starter limits across all tools. The difference: SEOLumina Standard still provides Keyword Difficulty, Opportunity Scores, and Sales Estimator — features that SellerSpy Premium doesn't have at any price.
Bottom line on pricing: If you need unlimited keyword generation volume and a simple Title Analyzer, SellerSpy Pro at $14.99/mo is straightforward. If you need competitive depth — Difficulty scores, Opportunity metrics, sales data, and seasonal planning — SEOLumina Starter gets you there for $12.99/mo, or $10.83/mo billed annually.
Where SellerSpy Wins
We're writing this on the SEOLumina blog, but here's where SellerSpy genuinely has an edge:
- Product Rank Checker. SellerSpy lets you check where your product ranks for a specific keyword. SEOLumina doesn't have this yet. If rank tracking is a core part of your workflow, this matters.
- Title Brainstorm. The Premium tier includes a title ideation tool that generates title options based on your keywords. SEOLumina's Product Creation tool tests titles you write — it doesn't generate them for you.
- Keyword Lists. SellerSpy lets you save and organize keyword research into lists. This is handy if you're planning multiple products at once and want to keep your research structured.
- Unlimited generation on Pro. SellerSpy Pro gives unlimited Keyword Generator and Explorer searches. SEOLumina's Starter - unlimited keyword generator searches. For sellers who do heavy keyword volume in a single session, this can matter.
- Established community. SellerSpy has been around longer and has more third-party reviews, affiliate blog posts, and podcast features. If community validation matters to you, SellerSpy has a larger footprint.
Where SEOLumina Wins
And here's where SEOLumina provides capabilities SellerSpy doesn't offer at any tier:
- Keyword Difficulty (1–99). The single biggest gap. SEOLumina tells you whether you can realistically rank for a keyword based on the strength of existing competition — not just the number of competing products. This eliminates the manual step of checking competition on TPT for every keyword.
- Opportunity Score (0–100). Combines demand, difficulty, and ranking potential into one number. High opportunity = teachers are searching AND the competition is beatable. This metric doesn't exist in SellerSpy.
- Product Explorer with Quality Scores. See exactly how top-ranking products are structured — keyword placement in title, first 250 characters, full description — plus a quality score for each listing. This level of competitor analysis helps you understand why products rank, not just that they rank. Explore this tool →
- Sales Estimator. Estimate competitor sales and revenue based on review velocity and product activity. Validate that a keyword opportunity translates to actual money before investing time in creation. Try Sales Estimator →
- Seasonal Keywords. Dedicated tool for monthly trend planning — see which keywords spike in which months so you can prepare products weeks before demand peaks. Plan seasonal content →
- Store Audit on Starter ($12.99/mo). SEOLumina includes Store Audit on its lowest paid tier. SellerSpy locks it behind Premium ($24.99/mo) — a $12/month difference for the same category of feature.
- Larger database. 450,000+ keywords and 3.5M+ analyzed products vs. SellerSpy's stated 300,000+ keywords.
Our Honest Take
We're not pretending to be neutral — this is the SEOLumina blog. But we also believe a dishonest comparison damages credibility more than it helps conversions.
SellerSpy is a legitimate tool that does what it promises. Its free keyword generator is genuinely useful, and many successful TPT sellers have built their workflow around it. If your current process is "find keywords → manually check competition on TPT → create product" and that process is working for you, there's no urgent reason to switch.
We built SEOLumina because we saw clear gaps. Keyword suggestions without difficulty scores force sellers into a manual verification loop that wastes time. No product-level quality analysis means keyword decisions are based on incomplete data. No sales estimation means you can't validate demand before committing hours to product creation. And locking Store Audit behind a $24.99/mo tier when it's one of the most impactful tools for existing sellers felt like the wrong trade-off.
SEOLumina was designed to give TPT sellers the same depth of marketplace intelligence that Amazon sellers and Google SEO professionals take for granted — but built specifically for the Teachers Pay Teachers ecosystem.
SEOLumina
More complete analytical toolkit starting at $12.99/mo. Keyword Difficulty, Opportunity Scores, competitor quality analysis, sales estimation, seasonal planning, and store auditing — all included on every paid tier. Best for sellers who want data-driven decisions without manual verification.
SellerSpy
Established tool with a solid free keyword generator, useful Title Analyzer and Rank Checker on paid tiers, and an active community. Good for sellers who want a simple workflow and don't need difficulty scores or sales data.
Can You Use Both?
Yes — and some sellers do. You can use SellerSpy's free keyword generator for quick brainstorming, then run those keywords through SEOLumina's Keyword Explorer to check Difficulty, Opportunity, and competitive landscape before making a final decision. You can also use SellerSpy's Rank Checker to monitor where your products appear — a feature SEOLumina doesn't yet offer.
If you're currently using SellerSpy and curious about SEOLumina, the easiest test is to start with SEOLumina's free tier. Run 5–10 keywords you've already researched in SellerSpy through SEOLumina and compare the depth of data you get back. If the Keyword Difficulty and Opportunity scores change which keywords you'd target, that tells you whether the switch is worth it for your workflow.
