Zappy US vs SYNC
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Zappy US
Rent a portable power bank to keep your devices charged while you're out and about. Never worry about a dead battery again and enjoy your day without interruption.
- Rent portable power banks
- Charge devices on the go
- Shared power bank network
- Enjoy uninterrupted day
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Get your power bank now and start to enjoy your day with Zappy! Charge your device on the go with our shared power banks.
SYNC
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A private space for two. SYNC is where you and your person stay close in the small, everyday ways — a thought sent at the right moment, a letter saved for later, a quiet game before bed. No feed, no followers, no strangers. Just the two of you. WHAT'S INSIDE • Pebbles — a tap to say "thinking of you" • Open-When letters — sealed until the right moment • Our Day — share your day as a little story • Moods — check in, without needing words • Games — playful things to do together • Plans — date nights, countdowns and shared goals • Our Month — a recap of your month, made to share PRIVATE BY DESIGN Your moments stay just between the two of you. Join SYNC, and get a little closer every day.
Screenshots
Verdict
The clearest difference is iOS requirement: Zappy US at 13.0 against SYNC's 15.1. 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Zappy US ships an update every 2 months, SYNC every 4 months. The most recent releases landed on November 4, 2026 and October 15, 2026 respectively.
| Parameter | Zappy US | SYNC |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (10 ratings) — better | — |
| Positive reviews | 75.0% of reviews | — |
| Number of ratings | 10 — better | — |
| Update frequency | Every 2 months — better | Every 4 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 13.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 120 MB | 54 MB |
| Age rating | 9+ | 17+ |
| Developer | Needzappy USA Inc. | Meherzan Turel |
In-app purchases
Zappy US
No in-app purchases
SYNC
No in-app purchases
