Last updated: 2026-09-10
This is the umbrella privacy policy for the TradeTools.dev family of mobile applications, developed and published by ZkDev — the developer name shown on our Google Play and App Store listings. Contact: support@tradetools.dev.
Each individual app has its own per-app privacy policy, listing that app by the exact name used on its store page and linked from the store listing — the principles below apply consistently across all apps.
Our apps collect minimal data for two purposes only: (1) crash reporting and (2) advertising on the free tier. Specifically:
Pro is a one-time purchase via the Apple App Store or Google Play — $2.99 for a single-purpose app, and a separate one-time price for TradeTools, which carries every calculator in one app. The transaction is between you and Apple/Google — we don't see your payment details. Pro status is verified locally on your device via the official StoreKit / Play Billing API.
Our apps are aimed at professional adults working in the trades. We do not knowingly collect data from children under 13.
All applications below are published by ZkDev on Google Play and the App Store. Each is listed by the exact name shown on its store page, together with its package identifier, so the policy can be matched to the listing it belongs to.
dev.tradetools.app)com.electools.box_fill_calculator)com.electools.breaker_size_calculator)com.electools.conduit_fill_calculator)com.electools.electrical_load_calculator)com.electools.grounding_size_calculator)com.electools.motor_fla_calculator)com.electools.transformer_calculator)com.electools.voltage_drop_calculator)com.electools.wire_size_calculator)com.hvactools.airflow_cfm_calculator)com.hvactools.duct_sizing_calculator)com.hvactools.electrical_load_hvac)com.hvactools.heat_load_calculator)com.hvactools.hvac_unit_converter)com.hvactools.pipe_sizing_calculator)com.hvactools.psychrometric_calculator)com.hvactools.refrigerant_charge_calculator)com.hvactools.refrigerant_pt_chart)com.hvactools.superheat_subcool_calculator)com.plumbtools.backflow_prevention)com.plumbtools.commercial_load)com.plumbtools.drainage_pipe_sizing)com.plumbtools.drainage_slope)com.plumbtools.fixture_unit_calculator)com.plumbtools.gas_pipe_sizing)com.plumbtools.head_loss_calculator)com.plumbtools.pipe_offset)com.plumbtools.septic_sizing)com.plumbtools.trap_vent_sizing)com.plumbtools.water_heater_sizing)com.plumbtools.water_pipe_sizing)com.solartools.batterysizing)com.solartools.conduitfill)com.solartools.groundmount)com.solartools.invertersizing)com.solartools.nec690)com.solartools.solarpanelsizing)com.solartools.production)com.solartools.solarroi)com.solartools.solarwiresizing)com.solartools.voltagedrop)com.firetools.fire_alarm_calc)com.firetools.fire_extinguisher_calc)com.firetools.fire_pump_sizing)com.firetools.hanger_spacing)com.firetools.hazard_classification)com.firetools.nfpa_code_reference)com.firetools.pipe_schedule_sprinkler)com.firetools.sprinkler_hydraulic_calc)com.firetools.standpipe_calculator)com.firetools.water_supply_analysis)com.carpentrytools.anglemiter)com.carpentrytools.concrete)com.carpentrytools.deck)com.carpentrytools.drywall)com.carpentrytools.fence)com.carpentrytools.framing)com.carpentrytools.lumber)com.carpentrytools.rafter)com.carpentrytools.roofarea)com.carpentrytools.spantable)com.carpentrytools.stair)com.carpentrytools.trim)com.buildtools.concrete_calculator)com.buildtools.fence_calculator)Each app suite has its own group-level privacy disclosure with full details:
Questions about this policy: privacy@tradetools.dev