CallStar vs SBK Flex
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CallStar
Manage inbound business calls, utilize versatile number services, and access teleconference features directly from your mobile device. Optimize outbound calls with Least Cost Routing. Requires configuration from a CallStar service provider.
- Inbound call management
- Versatile number service
- Teleconference features
- Least Cost Routing (LCR)
- FLCR for international calls
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CallStar is an advanced and easy-to-use mobile phone exchange service. CallStar enables you to manage the inbound calls of your business and utilize versatile number service and teleconference features straight from your mobile device. You can also use Least Cost Routing for your national and internation outbound calls (LCR and FLCR). Currently, we only serve companies operating in Finland. NOTE: To start using the CallStar application, you will need to configure the settings and the login credentials from your CallStar service provider. If your company is not using the CallStar service, there's no benefit from this application for you. In such case, please do not download or rate the application.
SBK Flex
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SBK Flex is designed for SBK Telecom customers. An active SBK Telecom account is required to use the app. With simple setup, reliable connection, and professional features, SBK Flex keeps you connected whether you’re on the road or in the office. If you’re already using SBK Telecom services, SBK Flex gives you full calling capability in the palm of your hand.
Screenshots
Verdict
The clearest difference is update cadence: SBK Flex at every 4 weeks against CallStar's every 4 months. CallStar's advantage is device support (3 vs 1) and iOS requirement (8.0 vs 16.0). 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
CallStar ships an update every 4 months, SBK Flex every 4 weeks. The most recent releases landed on October 22, 2026 and October 25, 2026 respectively.
| Parameter | CallStar | SBK Flex |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 4 months | Every 4 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 8.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 14 MB | 117 MB |
| Age rating | 4+ | 12+ |
| Developer | Nordcom Oy | SBK Telecom |
In-app purchases
CallStar
No in-app purchases
SBK Flex
No in-app purchases
