MOSTLY AI
By Syntho (MOSTLY AI, powered by Syntho). Category: Test data generation. Homepage
MOSTLY AI's documentation describes a synthetic data platform that also uses LLMs to generate mock data for testing, prototyping and development. The docs describe self-hosted deployment on Kubernetes through a Helm chart, including EKS, OpenShift, GKE and AKS. An open-source Synthetic Data SDK, licensed under Apache-2.0, runs in local or client mode. Free-tier users receive new credits every day. Heavier usage requires purchasing credits. Syntho announced on 2026-06-09 that it had acquired the MOSTLY AI trademark and related assets. The brand continues as MOSTLY AI, powered by Syntho.
Description written from the vendor's documentation.
Status
Status: Acquired
Syntho announced the acquisition of the MOSTLY AI brand (trademark and related assets) on 9 June 2026; the brand continues as 'MOSTLY AI, powered by Syntho'.
Facts
| Fact | Value | Evidence | Source | Verified on |
|---|---|---|---|---|
| Status | Acquired | Documented | syntho.ai | |
| Founded | Not documented | Not documented | None found | |
| Headquarters | Not documented | Not documented | None found | |
| AI capabilities | Documented | mostly.ai | ||
| Test creation | Not documented | Not documented | None found | |
| Test output | Not documented | Not documented | None found | |
| Surfaces | Not documented | Not documented | None found | |
| Hosting | Documented | mostly.ai | ||
| Pricing model | Documented | mostly.ai | ||
| Free tier | Yes | Documented | mostly.ai | |
| CI integrations | Not documented | Not documented | None found | |
| Self-healing | None documented | Not documented | None found | |
| Agent integration | Not documented | Not documented | None found | |
| Open source | Yes, licence Apache-2.0 (Synthetic Data SDK) | Documented | github.com |
Published prices
No prices are published. The pricing model includes quotes on request.
Vendor-stated, verbatim
What Syntho (MOSTLY AI, powered by Syntho) says about its product, quoted as published and not confirmed in documentation.
“Powered by the industry leading TabularARGN model architecture, generate high-fidelity synthetic data with built-in differential privacy, 100x faster training, advanced sampling, and support for complex tabular and textual datasets.”
“Synthetic Switzerland" Unlocks 89% more Customer Data”
“Using the Synthetic Data SDK with our whole customer base, we can increase access from 11% to 100% with a synthetic customer base”
“best-in-class synthetic data quality while being 1–2 orders of magnitude more efficient than comparable models”
Alternatives
Tools in the same category (Test data generation), ordered by the number of shared creation and surface values, then by name. Each line lists documented facts that differ from MOSTLY AI.
- Curiosity Software: documents output Mixed; creation by natural language, recording, code generation; hosting cloud
- DATAMIMIC: Test data generation; no documented difference in output, creation, hosting or free tier
- GenRocket: Test data generation; no documented difference in output, creation, hosting or free tier
- K2view Test Data Management: documents hosting cloud
- Mockaroo: documents hosting cloud
- Perforce Delphix: documents status acquired
Comparisons
Questions
Is this page a review of MOSTLY AI?
No. This page is a fact sheet. Each fact shows its evidence level, its source and the date it was checked. We do not rate or rank tools.
Does MOSTLY AI have a free tier?
Yes. MOSTLY AI has a free tier. This is documented, checked on 2026-09-24.
What test output does MOSTLY AI produce?
The test output format is not documented as of 2026-09-24.
Is MOSTLY AI still available?
Status: Acquired, checked on 2026-09-24. The status note above gives the date and source.
Sources
- MOSTLY AI powered by Syntho: Data Access and Data Insights for Everyone (homepage) Opened
- Synthetic test data for software testing (use case) Opened
- MOSTLY AI Docs home Opened
- What is mock data? (MOSTLY AI Docs) Opened
- What are credits? (MOSTLY AI Docs) Opened
- mostly-ai/mostlyai Synthetic Data SDK (GitHub) Opened
- Syntho Acquires MOSTLY AI Brand Opened
- MOSTLY AI pricing (404) Opened
Spotted an outdated or wrong fact about MOSTLY AI? Send the source and we apply it at the next monthly update.