AbtoVoIPClient vs C
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
AbtoVoIPClient
This application provides voice and video calling capabilities, along with text chat, for users with SIP accounts. It supports direct calls between clients and offers secure communication options. The app integrates with native iOS call features for a seamless user experience.
- Voice calls
- Video calls
- Text chat
- Works with all popular SIP servers
- Direct calls between clients
- Secure calls using SRTP/ZRTP
- CallKit integration
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ABTO Software's VoIP SIP softphone. Can be used to call sip numbers and landline numbers (if sip provider has this option). Features: voice calls; video calls; text chat (based on SIP MESSAGE request); works with all popual SIP servers, including Asterisk/FreeSwitch; make direct calls between clients without SIP server; allows to use UDP/TCP/TLS protocols for SIP transport; ability to make secure calls using SRTP/ZRTP; supports STUN/ICE; IPv6 support; CallKit - native incoming call UI and system integration of VoIP calls; 2 simultaneous calls; call conferencing; attended transfer.
C
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C-PASS is a contactless fueling solution that allows customers to fuel at participating service stations using a windshield decal linked to their registered vehicle and payment method. Once the customer’s account, vehicle, decal, subscription, and default payment method are active, C-PASS enables a faster and more convenient fueling experience.
Screenshots
Verdict
The clearest difference is update cadence: C at every 2 weeks against AbtoVoIPClient's every 5 months. On price, ads, in-app purchases and device support 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.
AbtoVoIPClient ships an update every 5 months, C every 2 weeks. The most recent releases landed on October 23, 2026 and October 25, 2026 respectively.
| Parameter | AbtoVoIPClient | C |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (3 ratings) — better | — |
| Positive reviews | 66.7% of reviews | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 5 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 15.6 |
| Further details — not scored | ||
| Size | 12 MB | 81 MB |
| Age rating | 4+ | 4+ |
| Developer | Sviatoslav Volodymyruvych Litynsky Private Enterpreneur | CONVENIENCE PAY TECHNOLOGIES LTD |
In-app purchases
AbtoVoIPClient
No in-app purchases
C
No in-app purchases
