Test Data Generator Pricing (2026): Flat vs Metered vs Quote-Gated

Test data generator pricing looks simple until you line the plans up, because the leading tools don't charge on the same axis. Tonic Fabricate meters per generation turn, Mockaroo charges by the rows in a file, GenRocket sells a quoted annual license, and Seedfast bills a flat monthly rate set by table count. Match those plans against each other and identical monthly figures buy incomparable things, since a bill that climbs with every CI run and one that never moves behave nothing alike at the same sticker price. The price question still deserves a straight answer, and that answer only makes sense read next to what each dollar actually buys.

The table lines up all four on the axis that actually drives each bill, rather than on a single headline number; the full comparison hub has the feature-by-feature matrix behind the prices.

All competitor figures were verified June 2026 against the linked sources; the Seedfast figures come from its own pricing page.

Mockaroo pricing is the easiest of the four to reason about, because it turns on a single variable, the number of rows in one generated file. The free tier caps a file at 1,000 rows and allows 200 API requests a day, generous enough for one-off flat exports and fine for a demo or a fixture. Paid tiers raise the row ceiling, verified June 2026 against mockaroo.com/pricing. Silver at $60 a year lifts a file to 100,000 rows, Gold at $500 a year to 10 million rows, and Enterprise at $7,500 a year removes the cap. What that buys is volume rather than structure, so the bill tracks how large a dataset gets, not how tangled the schema is. One wide table of rows is cheap here. A Postgres schema of twenty related tables costs no more, because Mockaroo never models the relationships between them in the first place. Where row count is the wall you keep hitting, rows-per-file is a fair axis to pay on, and the Mockaroo alternative page picks up where that axis stops fitting.

Tonic Fabricate pricing works the opposite way, turning on how much you generate rather than how much comes out. It runs on generation credits plus token usage, confirmed June 2026 against tonic.ai/pricing. The free plan includes $10 a month in credits, enough for light exploratory work and a real feel for the browser experience. Plus is $29 a month and folds in $25 a month of credits, after which pay-as-you-go kicks in at roughly $0.17 for a standard turn and about $0.37 for a complex, multi-table one. The structure matters more than the exact cents, because every run past your credits spends more of them, so the bill rises with usage. That suits occasional interactive sessions and gets harder to hold still once a generator lives inside CI and fires on every build, where per-turn cost compounds with build frequency instead of team size. The Seedfast vs Tonic Fabricate comparison runs the pricing math through in full.

GenRocket sits in a different buying motion altogether. It publishes no public price list, no free tier, and no trial; the pricing page routes you to a quote request, so the number reaches you through sales rather than off a page. The one figure GenRocket publishes itself, on its value-for-money page (as of June 2026), anchors licensing at about $55,000 a year, framed there against legacy test data management it says can run past a million dollars. That tells you which tier you are shopping in. With a quote-gated tool the license is rarely the whole cost. The entry plan carries a twenty-project minimum, a fixed onboarding block, and a procurement lane you clear before the first row lands, so time-to-first-seed is measured in a sales cycle rather than minutes. For a team modeling scenario data across many databases, that overhead is the platform doing its job. For one Postgres schema that needs rows in CI, it is a lot of platform to buy, which the GenRocket alternative page takes apart.

Seedfast charges a flat monthly rate set by how many tables you seed at once, with nothing metered underneath, verified against Seedfast pricing in June 2026. Basic is $8 a month for up to 25 tables per seed, Premium $12 for up to 50, and Premium+ $16 for up to 100, and every paid plan includes unlimited seeds, so the number on the plan is the number on the invoice whether you seed weekly or on every commit. Evaluation runs free first, a 30-day trial that takes no card and covers up to 50 tables and 25 seeds, which is enough to seed a real schema in CI and watch it hold rather than poke at a toy. Flat pricing is forecastable by construction, since no axis moves the figure once you have chosen a plan. The honest limits are two. Seedfast is Postgres-only, so a multi-engine shop is better served elsewhere, and the trial is time-boxed rather than open-ended, so Seedfast is not free forever. Inside its lane, seeding a Postgres database in CI, the cost is a fixed line item you can budget once and forget.

Comparing sticker prices tells you little here, because the axes differ. A more honest estimate takes how you will actually use the tool and pushes it through each model. Count the seeds or generation runs you expect in a typical month, multiply by the cost each model assigns to a run, and the shapes separate quickly. A rows-per-file tool charges the same whether you generate once or fifty times, so its cost stays flat but capped by volume. A per-turn tool multiplies its per-run price by your run count, so a generator that fires on every CI build carries a bill that grows with build frequency. A quote-gated license is fixed but large, and a flat monthly plan is fixed and small, independent of run count altogether. Forecastability is the quiet variable most pricing pages skip. A cost you can predict a year out is easier to defend in a budget than a lower one that swings with usage. Vendors also reprice over time, so confirm the current figure at each source before you commit.

Mockaroo is free for files up to 1,000 rows with 200 API requests a day, then paid by file size on annual plans, verified June 2026 at mockaroo.com/pricing. Silver is $60 a year for 100,000 rows per file, Gold $500 a year for 10 million, and Enterprise $7,500 a year for unlimited rows and users. The bill follows dataset size, so a larger file costs more while schema complexity costs nothing.

Tonic Fabricate runs on generation credits plus per-turn usage, confirmed June 2026 at tonic.ai/pricing. The free plan includes $10 a month in credits, Plus is $29 a month with $25 a month in credits, and beyond credits you pay roughly $0.17 per standard turn and $0.37 per complex turn. Because it meters generation, the bill scales with how much data you produce, which makes a CI generator that runs on every build the case to model most carefully.

For continuous integration, the cheapest model is generally the one that does not charge per run. A generator in CI fires on every build, so a per-turn tool like Tonic Fabricate scales its bill with build frequency and a rows-per-file tool like Mockaroo scales its friction the same way, while a flat monthly plan such as Seedfast holds at one price no matter how often the pipeline runs. Which is cheapest in practice depends on your build volume, so estimate runs per month against each model rather than trusting a headline price (figures as of June 2026).

Seedfast is flat monthly pricing with no metering, verified at Seedfast pricing in June 2026. A 30-day free trial takes no card and covers up to 50 tables and 25 seeds, after which Basic is $8 a month, Premium $12, and Premium+ $16, each with unlimited seeds. Plans differ by how many tables you seed at once, not by rows, tokens, or generation runs, so the price you pick is the price you pay.

The sharper question is not which number is smallest but which axis matches how you work. If your test data is flat and occasional, Mockaroo's row-based plans are priced for exactly that. If you generate interactively in a browser and value AI-assisted iteration, Tonic Fabricate's credit model fits, with the caveat that CI usage compounds it. If you are governing test data across many systems at enterprise scale, GenRocket's quoted license is built for that scope. And if the job is seeding a Postgres database in CI on a cost you can forecast a year out, a flat per-table plan is the model that stays still. Seedfast's 30-day free trial takes no card.