Comparison

STF Sleep Research vs CypherAir

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

Head to head
About

STF Sleep Research

This utility app synchronizes health data from wearable devices to Apple Health. It assists researchers in studying sleep sciences by collecting steps, sleep, and heart rate information. Authorization is required to enable data syncing.

Highlights
  • Track paired wearing equipment data
  • Sync steps, sleep, and heart rate
  • Integrates with Apple Health
  • Supports sleep science research
  • Concise and straightforward interface
Features
Read full description

STF Sleep Research is a concise app that can track paired wearing equipment data. The app will help Stanford University researchers to study Sleep Sciences. Attention: - After you authorize, you can sync your steps, sleep, heart rate, and other health data from this app to Apple "Health" app.

About

CypherAir

Read full description

CypherAir is a fully offline, open-source OpenPGP encryption tool built for iOS, iPadOS, macOS and VisionOS. It makes zero network connections. There is no telemetry, no tracking, and no possibility of data leakage. Two Encryption Profiles • Universal (Profile A) — Interoperable with GnuPG and all major PGP implementations. RFC 4880 compliant, employing Ed25519 and X25519 with SEIPDv1. • Advanced (Profile B) — Implements the latest OpenPGP standard, RFC 9580, with Ed448 and X448, authenticated encryption via AEAD (SEIPDv2), and Argon2id passphrase protection. Capabilities • Encrypt and decrypt text and files, processed as streams for efficiency • Create digital signatures — cleartext for messages, detached for files • Exchange public keys through QR codes using the system Camera, with no camera permission required • Manage multiple keys, each with its own encryption profile • Safeguard private keys in the Secure Enclave, unlocked only by Face ID or Touch ID Privacy Through Architecture • The sole system permission is the Face ID usage description • Private keys never leave the protection of Secure Enclave wrapping Open Source CypherAir is open source and available under the GNU General Public License v3.0 or later (GPL-3.0-or-later) or the Mozilla Public License 2.0 (MPL-2.0). Additional languages are in progress. Disclaimer No Warranty: You expressly acknowledge and agree that use of the Licensed Application is at your sole risk. To the maximum extent permitted by applicable law, the Licensed Application and any services performed or provided by the Licensed Application are provided "as is" and "as available," with all faults and without warranty of any kind, and Licensor hereby disclaims all warranties and conditions with respect to the Licensed Application and any services, either express, implied, or statutory, including, but not limited to, the implied warranties and/or conditions of merchantability, of satisfactory quality, of fitness for a particular purpose, of accuracy, of quiet enjoyment, and of noninfringement of third-party rights. No oral or written information or advice given by Licensor or its authorized representative shall create a warranty. Should the Licensed Application or services prove defective, you assume the entire cost of all necessary servicing, repair, or correction. Some jurisdictions do not allow the exclusion of implied warranties or limitations on applicable statutory rights of a consumer, so the above exclusion and limitations may not apply to you.

Screenshots

STF Sleep Research4 screens
CypherAir4 screens

Verdict

The call

The clearest difference is update cadence: CypherAir at every 2 days against STF Sleep Research's every 5 weeks. CypherAir also leads on device support (4 vs 2). STF Sleep Research's advantage is iOS requirement (10.0 vs 26.5). On price, 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

STF Sleep Research ships an update every 5 weeks, CypherAir every 2 days. Both last shipped on October 25, 2026.

Scorecard3 real differences · 7 level
STF Sleep Research versus CypherAir: the parameters behind the verdict, then further details
ParameterSTF Sleep ResearchCypherAir
PriceFreeFree
Rating2.3 (3 ratings) — better—
Positive reviews0.0% of reviews—
Number of ratings3 — better—
Update frequencyEvery 5 weeksEvery 2 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPodiPhone, iPad, Mac, Vision Pro — better
Requires iOS10.0 — better26.5
Further details — not scored
Size117 MB79 MB
Age rating4+4+
DeveloperZepp Inc.康 陈

In-app purchases

None

STF Sleep Research

No in-app purchases

None

CypherAir

No in-app purchases

Questions

Is STF Sleep Research free?
STF Sleep Research is free to download, with no in-app purchases.
Is CypherAir free?
CypherAir is free to download, with no in-app purchases.
Do STF Sleep Research or CypherAir have ads?
Neither STF Sleep Research nor CypherAir shows ads.
Which is updated more often, STF Sleep Research or CypherAir?
STF Sleep Research ships an update every 5 weeks, and CypherAir every 2 days. Most recently, STF Sleep Research was updated on October 25, 2026 and CypherAir on October 25, 2026.

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