Support

Last updated 22 June 2026.

Need help? Email support@vahtian.com and we'll get back to you, usually within a few business days. Vahtian is a small independent project, so please be patient.

Contact

General help, bugs, feature requests: support@vahtian.com
Privacy, data, and GDPR requests: privacy@vahtian.com

When reporting a problem, it helps to include your device and iOS version, which app (MatchVahti or MatchVahti Lite), and the steps that led to the issue.

The apps

MatchVahti Lite — search PubMed, tap the sentences worth citing, and export a reviewable Zotero .ris. A fast citation-capture tool.
MatchVahti — blinded, claim-by-claim evidence screening with a tamper-evident audit trail and an optional AI second opinion. For rigorous, systematic-review-style work.

Frequently asked questions

Where is my data stored?

On your device. The apps are local-first — your projects, captures, ratings, and notes stay on your device and are not uploaded. There are no accounts. See the privacy notice for the full detail.

Do I need an account or a subscription?

No. There are no accounts, and the apps are a one-time purchase — no subscription. The optional AI second opinion uses your own model or API key, so there is no AI subscription either.

How do I export to Zotero?

Use the export action to produce a .ris file (download or share sheet). In Zotero, choose File → Import… and pick the .ris file. The export is a plain, reviewable file — nothing is written to your library automatically. Each export is timestamped so batches don't overwrite each other.

How does search work?

Search runs against PubMed via the US National Library of Medicine's NCBI E-utilities. It is search-only. You can optionally add an NCBI contact email and API key (stored only on your device) to follow NCBI's rate-limit etiquette.

How do I use the AI second opinion? (MatchVahti)

It is optional and off by default. Turn it on under the optional assists, choose a local model (e.g. on your computer at an http://localhost endpoint) or an external provider with your own API key. Your key stays on your device and is never sent to us. The AI is consulted only after your own rating is recorded, so it can never anchor your judgement.

What's the difference between MatchVahti and MatchVahti Lite?

Lite is a citation-capture companion — read, capture, export. MatchVahti adds rigorous, blinded claim×paper rating with a hash-chained, tamper-evident audit trail, an optional AI second opinion, a citation map, and richer exports. Start with Lite for capture; step up to MatchVahti when you need an auditable screening trail.

How do I back up my work? (MatchVahti)

Use Download backup (JSON) to save one portable file containing your project, local records, and audit chain. Restoring on another device replaces that device's MatchVahti data. Because the apps are local-first, clearing app data (or the system reclaiming storage) removes your work — back up before that happens.

Privacy

See the full privacy notice. In short: no analytics or tracking in the apps, your data stays on your device, and the only network call by default is the PubMed search you run.