Comparison

Fast vs Voltn

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Fast

Features
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FAST-Parapheur est le service de signature électronique proposé par Docapost-Fast, opérateur de service de confiance électronique à destination des entreprises et collectivités locales. Conviviale et rapide, la déclinaison de FAST-Parapheur pour iPad permet de signer électroniquement tout document au format PDF mis à disposition sur l’application tout en respectant scrupuleusement l’article 1316-1 du code civil (conférant à la signature électronique la même valeur que la signature manuscrite).

About

Voltn

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Every organization runs on its files: contracts, records, plans, invoices. Voltn (formerly NetExplorer) brings them together and makes them accessible wherever you are, right from your smartphone. FIND EVERYTHING, EVERYWHERE Your folders and files: browse, search, organize. The data that matters, in one place — available on the go. And with offline mode, your files remain available even without an internet connection. SHARE AND STAY IN CONTROL Configurable sharing links with password protection, expiration dates, single-download limits and real-time download receipts. YOUR PLATFORM FOLLOWS YOU The app extends your Voltn platform: same spaces, same access rights, same traceability. What your team organizes at the office is right at hand when you're on the move. TRUST, PROVEN Voltn is a French software company. Over 15 years of expertise, 2,000 client organizations, 300,000 daily users, more than 500 million files stored. Data hosted in France or Luxembourg on SecNumCloud-certified infrastructure (service qualification in progress). ISO 27001 and HDS (French Health Data Hosting) certified. GDPR and NIS2 compliant, outside the scope of the CLOUD Act. Access to the app requires a subscription to a Voltn platform at voltn.eu Voltn - The file company

Screenshots

Fast4 screens
Voltn4 screens

Verdict

The call

The clearest difference is iOS requirement: Fast at 11.0 against Voltn's 15.6. On price, update cadence, ads and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Fast ships an update every 3 months, Voltn every 2 months. The most recent releases landed on October 2, 2026 and October 3, 2026 respectively.

Scorecard1 real difference · 5 level
Fast versus Voltn: the parameters behind the verdict, then further details
ParameterFastVoltn
PriceFreeFree
Update frequencyEvery 3 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.0 — better15.6
Further details — not scored
Size8 MB31 MB
Age rating4+4+
DeveloperDOCAPOSTE FASTNetExplorer

In-app purchases

None

Fast

No in-app purchases

None

Voltn

No in-app purchases

Questions

Is Fast free?
Fast is free to download, with no in-app purchases.
Is Voltn free?
Voltn is free to download, with no in-app purchases.
Do Fast or Voltn have ads?
Neither Fast nor Voltn shows ads.
Which is updated more often, Fast or Voltn?
Fast ships an update every 3 months, and Voltn every 2 months. Most recently, Fast was updated on October 2, 2026 and Voltn on October 3, 2026.

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