Comparison

Handbook Mobile vs Letro

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

Head to head
About

Handbook Mobile

This app provides employees with instant access to company policies, training materials, and procedures on their mobile devices. It streamlines onboarding, facilitates training completion, and allows for document signing, ensuring teams stay informed and compliant.

Highlights
  • Policy and procedure search
  • Effortless new staff onboarding
  • Review and complete training
  • E-signatures on documents
  • Training video access
  • Instant answers to questions
  • Real-time notifications
Features
Read full description

Give your team the answers they need about your business — right in the palm of their hand with Handbook. Introducing the Handbook mobile app, your team can onboard & review employee documents, training, and policies on the go.  Key Features: POLICY & PROCEDURE SEARCH Quickly find and review your company’s policies, SOPs, and procedures, keeping your team informed and aligned. ONBOARD NEW STAFF EFFORTLESSLY Onboard your new team members in a snap by giving them the convenience of a simple mobile app. REVIEW & COMPLETE TRAINING Track and complete mandatory training courses, take quizzes, and sign off on documents directly from your device. E-SIGNATURES ON DOCUMENTS Effortlessly sign documents directly from your mobile device, ensuring compliance and simplifying administrative tasks. TRAINING VIDEO ACCESS Access your company’s library of training videos anytime, anywhere, allowing employees to learn at their own pace. INSTANT ANSWERS Search through your company’s resources to get immediate answers to any questions, so you're always up to date. REAL TIME NOTIFICATIONS Receive instant alerts when policies or procedures are updated, ensuring you're always in the loop and compliant. Stay connected and efficient with the Handbook mobile app — simplifying training, compliance, and document management wherever you are.  Plus, you can log into the web platform to view comprehensive stats, track progress, generate reports, and dive deeper into team performance and compliance metrics.

About

Letro

This secure communication platform offers end-to-end encrypted messaging, file sharing, and document exchange for enterprises. It provides a tamper-proof, blockchain-verified record of all communications, designed to replace email and chat with enhanced security and compliance features.

Highlights
  • End-to-end encryption
  • Blockchain-verified records
  • Spam and phishing proof
  • Role-based permissions
  • Automated approval chains
  • Decentralized and federated architecture
  • Offline communication capability
Features
Read full description

Email is insecure. Chat isn't compliant. Letters are stuck in the past. Letro replaces all three. Letro is the next generation of secure formal communication — built for the way enterprises, governments, law firms, and financial institutions actually work. Like email, but end-to-end encrypted, spam-free, phishing-proof, and verified by blockchain. Every message you send leaves a permanent, tamper-proof record. **End-to-End Encryption Built for the Future** Every message, file, and document is encrypted on your device before it leaves the app. Built on the Matrix Protocol — combined with quantum-resistant encryption — Letro protects your communications today and shields them against tomorrow's quantum computing threats. Your private keys never leave your device. Only you hold the keys to your data. **Zero Spam. Zero Phishing. By Design.** Unlike legacy email, Letro makes spam and phishing attacks virtually impossible — not through filters, but through architectural design. No suspicious links. No credential theft. No inbox chaos. Just verified communication with people you trust. No user can create two account with the same identity and without KYC verification, one cannot create an account. **Enterprise-Grade. Government-Ready.** Letro is purpose-built for organizations with complex compliance requirements: • Role-based permissions and access controls • Automated approval chains and escalation paths • Full audit trails for regulated industries • End-to-end encryption that scales across organizational hierarchies Trusted by teams in finance, law, government, and high-security enterprise environments. **Decentralized & Federated — Your Server, Your Rules** Letro runs on a fully decentralized, federated architecture. Unlike centralized platforms where one company controls all your data, Letro federates across independent private servers. Organizations can purchase and deploy their own dedicated Letro server, giving your business complete sovereignty over your communication infrastructure. Your messages never touch a server you don't control. Thanks to the Matrix protocol, companies and client can communicate with each other externally even when they run Letro on their private server. **Who Uses Letro?** - Teams replacing Slack and email with encrypted internal messaging on their own server - Businesses dealing with highly sensitive documents and internal communications - Enterprises with multiple client communications - Law firms requiring certified, tamper-proof document exchange - Banks and financial institutions needing auditable, compliant messaging - Government agencies demanding sovereign, encrypted communication channels - Enterprises building secure internal and client-facing communication workflows cross border or national - Privacy-conscious professionals who refuse to compromise on security **Your Data. Your Server. Your Rules. Always.** Letro holds no private keys and collects no message content. Deploy on your own private server for total data sovereignty — or use Letro's network and still maintain full end-to-end encryption. Zero surveillance. Zero data mining. No central authority. No exceptions. *Download Letro — and finally communicate with confidence.*

Screenshots

Handbook Mobile4 screens
Letro4 screens

Verdict

The call

The clearest difference is update cadence: Handbook Mobile at every 4 days against Letro's every 2 weeks. Handbook Mobile also leads on iOS requirement (15.6 vs 18.5). Letro's advantage is ratings volume (3 vs 1). On price, rating, 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.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Handbook Mobile against 5.0 for Letro. Both are backed by a comparable volume of ratings — 1 and 3 respectively.

UpkeepUpdate frequency

Handbook Mobile ships an update every 4 days, Letro every 2 weeks. The most recent releases landed on October 8, 2026 and October 24, 2026 respectively.

Scorecard3 real differences · 7 level
Handbook Mobile versus Letro: the parameters behind the verdict, then further details
ParameterHandbook MobileLetro
PriceFreeFree
Rating5.0 (1 ratings)5.0 (3 ratings)
Positive reviews—100.0% of reviews
Number of ratings13 — better
Update frequencyEvery 4 days — betterEvery 2 weeks
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.6 — better18.5
Further details — not scored
Size31 MB340 MB
Age rating4+12+
DeveloperGreySignal, Inc.Letro

Customer experience

Handbook Mobile

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Letro

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Handbook Mobile

No in-app purchases

None

Letro

No in-app purchases

Questions

Is Handbook Mobile free?
Handbook Mobile is free to download, with no in-app purchases.
Is Letro free?
Letro is free to download, with no in-app purchases.
Which has better reviews, Handbook Mobile or Letro?
Handbook Mobile and Letro are both rated 5.0 out of 5 on the App Store, from 1 and 3 ratings respectively.
Do Handbook Mobile or Letro have ads?
Neither Handbook Mobile nor Letro shows ads.
Which is updated more often, Handbook Mobile or Letro?
Handbook Mobile ships an update every 4 days, and Letro every 2 weeks. Most recently, Handbook Mobile was updated on October 8, 2026 and Letro on October 24, 2026.

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