Comparison

Sign documents Fast & Secure vs KarHub

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

Head to head
About

Sign documents Fast & Secure

Features
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Sign, store, and share important documents in seconds — securely and entirely on your device. Create & Sign Documents Instantly Import any document using your camera, photo gallery, or file manager. Draw your signature directly on the screen, adjust its style, size, and position, and apply it exactly where needed. Customizable Signatures Fine-tune your signature with adjustable pen thickness, color, and transparency. Stay Organized All signed documents are stored locally in a clean, private archive. Export them anytime and share them via email, messengers, cloud storage, or any other service on your device. Fast, Private & Secure No data leaves your device unless you choose to share it. Your documents stay yours — always. Perfect for: - Contracts and agreements - Invoices and receipts - Permission slips - Any paperwork that needs your signature on the go Get it done. Sign fast. Stay secure. Privacy Policy: https://docs.google.com/document/d/1mT6baoDVgsjdyvTjFOUIB00yvbuzNuOxG3lcL12mvqg/edit?usp=sharing Term of Use: https://docs.google.com/document/d/1MFu4zwXSnDzml_WoP_znJ4OGtUQisZIc7HeGdTmrV60/edit?usp=sharing

About

KarHub

Features
Read full description

Most car apps do one thing. KarHub is the one that remembers everything — and actually does something with it. Add your VIN once. KarHub decodes your exact year, make, model, trim and engine, and every answer it gives from then on is about your car specifically. WHAT YOU GET FREE • Service history that stays put. Log oil changes, brakes, tires, anything. Date, mileage, cost and notes, in one timeline instead of a glovebox full of receipts. • Maintenance rings. Every interval is a ring that drains as it elapses, so you can see where you stand without doing arithmetic. Tap one to log it. Add your own for anything KarHub doesn't cover. • Reminders that do the maths. Oil change due dates calculated from how you actually drive, not a guess. Registration renewals and monthly odometer prompts too. • Open recall alerts, checked against NHTSA's live database for your vehicle. Recalls are free to fix and easy to miss entirely. • Nearby repair shops with addresses, distance and directions. • A tire life guide, the penny test, step by step, and what each result actually means. KARHUB PLUS • Otto, your AI mechanic. Ask anything about your car. Otto can see your service history and mileage, searches the web for real specifications rather than guessing, and shows you where each answer came from. Send a photo of a warning light or a leak and ask about that. • Fluid specs, filled in for you. Otto looks up the oil weight, capacity and fuel grade for your exact vehicle and saves them, clearly marked so you can check them against your owner's manual. • Quotes, collected for you. Pick a job and how many shops to ask. KarHub emails them on your behalf, reads the replies, pulls out the prices and lays them side by side. You never write an email. • Booking and reminders. When a shop offers a time, book it in a tap. It goes on your calendar, you get a reminder the day before, and cancelling sends the shop a note. • Your whole garage. Track as many vehicles as you own. SUBSCRIPTION KarHub Plus is $7.99/month or $59.99/year. Tracking your car is free, permanently, the subscription covers the features that cost us money to run. Privacy Policy: https://karhub.app/privacy Terms of Use: https://karhub.app/terms

Screenshots

Sign documents Fast & Secure4 screens
KarHub4 screens

Verdict

The call

The clearest difference is iOS requirement: Sign documents Fast & Secure at 15.6 against KarHub's 18.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

CostPrice Ā· In-app purchases Ā· Ads Ā· Monetization

Both are free to download. Sign documents Fast & Secure sells 2 in-app purchases, starting at $5.99 per 7 days and KarHub sells 2 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on October 19, 2026 and October 20, 2026 respectively.

Scorecard1 real difference Ā· 5 level
Sign documents Fast & Secure versus KarHub: the parameters behind the verdict, then further details
ParameterSign documents Fast & SecureKarHub
PriceFreeFree
Update frequencyMonthlyMonthly
AdsNoNo
In-app purchasesYesYes
DevicesiPhone, iPod — betteriPhone
Requires iOS15.6 — better18.0
Further details — not scored
Size28 MB6 MB
Age rating4+4+
DeveloperUPPER UNIT Korlatolt Felelossegu TarsasagChalla Hadley

In-app purchases

2 purchases

Sign documents Fast & Secure

Subscriptions2
  • Unlock full access$5.997 Days
  • Fast & Secure Sign Pro3 Days trial$5.997 Days
2 purchases

KarHub

Subscriptions2
  • KarHub Plus Monthly$7.991 Month
  • KarHub Plus Annual$59.991 Year

Questions

Is Sign documents Fast & Secure free?
Sign documents Fast & Secure is free to download, with in-app purchases available.
Is KarHub free?
KarHub is free to download, with in-app purchases available.
Do Sign documents Fast & Secure or KarHub have ads?
Neither Sign documents Fast & Secure nor KarHub shows ads.
Which is updated more often, Sign documents Fast & Secure or KarHub?
Sign documents Fast & Secure ships an update monthly, and KarHub monthly. Most recently, Sign documents Fast & Secure was updated on October 19, 2026 and KarHub on October 20, 2026.

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