BT1 Tester vs WELT
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
BT1 Tester
This utility app tests 12V car batteries, providing results on their condition, such as good, bad, or needing replacement. It displays the battery's voltage, volume, and overall health.
- Tests 12V car battery voltage
- Measures battery volume
- Assesses battery health
- Displays test results (good, bad, replace)
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To test 12V car battery's voltage,volume,health,and then show the testing result on good,bad,replace...
WELT
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WELT-010 Wireless Electrical Tester / Analyzer The WELT-010, Bluetooth Low Energy Wireless Electrical Tester/Analyzer is designed to inspect and analyze wiring compliance to electrical code such as voltage drop under different load, find problem with splices, wiring connections and conductor quality based on impedance analysis. Connection and wire impedance is calculated based on voltage drop and real current value which is measured during voltage drop test. Also, The WELT-010 is able to perform electrical socket wiring connection verification (incorrect wiring), AFCI test (series), 30mA ground test, standard GFCI test, measure AC voltage and current. All of mentioned parameters directly influence to safety and performance of the electrical system. WELT-010 use iPhone or iPad as command and display unit that give new flexible functional opportunity. Main Functions Measuring Voltages (line to neutral, line to ground and neutral to ground) Measuring external RMS current and power. Verifies wires connections on the electrical socket (incorrect wiring). Measuring voltage drop under different load (5A, 10A, 15A and 20A) with measuring of real load current (without trip circuit breakers or blow fuses during tests). Real impedance calculation and indication based on measured load current GFCI test AFCI Series test 30mA ground test
Screenshots
Verdict
The clearest difference is update cadence: BT1 Tester at every 5 weeks against WELT's every 17 months. BT1 Tester also leads on iOS requirement (7.0 vs 16.0). 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.
BT1 Tester ships an update every 5 weeks, WELT every 17 months. Both last shipped on November 11, 2026.
| Parameter | BT1 Tester | WELT |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 5 weeks — better | Every 17 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 7.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 7 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Shenzhen Leagend Optoelectronics Co., Ltd. | Nikolay Nikitin |
In-app purchases
BT1 Tester
No in-app purchases
WELT
No in-app purchases









