RainRule review
RainRule turns field water-balance estimates into irrigation recommendations and controller runs.
Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026
RainRule is a cloud-based irrigation management service for growers who need field-level water estimates and scheduling. It combines rainfall, irrigation, crop use, and soil capacity to calculate root-zone water balance, using live weather and FAO-56 Penman-Monteith calculations. The service maps farms and fields, including pivot circles, and displays water-status heat layers alongside a seven-day outlook. Its weather-based calculations do not require hardware, while sensor readings can also be accepted through an equipment API. It is aimed at small and mid-market operations managing multiple fields that want recommendations tied to irrigation workflows.
Controller connections are a notable part of the product’s scope: RainRule supports Rachio, Hunter Hydrawise, OpenSprinkler, and custom webhooks. Growers can review controller runs or schedule automatic runs, and the system can send daily or weekly email digests about fields requiring water. It also exports field boundaries as GeoJSON or ISOXML. That makes RainRule a fit for farms whose controllers and mapping workflows align with these options; operations relying on other controller ecosystems should compare alternatives before committing. The published platform is web and API, with cloud deployment and email support.
Pricing is paid, with no free plan. The Monthly plan costs $49 per month and covers up to 100 fields across unlimited farms, up to five controller connections, digest emails, and email support. The Annual plan costs $490 per year and includes everything in Monthly plus priority email support. Both plans provide a 14-day trial. RainRule is worth considering for growers who want crop- and soil-informed recommendations with optional controller automation under one plan. Farms that need more than five controller connections on the Monthly plan, or do not use a supported connection, may be better served by another option.
RainRule pros and cons
- Where it wins
- Calculates root-zone water balance using weather, crop use, and soil capacity
- Shows a seven-day outlook and field-specific depth and runtime recommendations
- Connects Rachio, Hunter Hydrawise, OpenSprinkler, and custom webhooks
- Where it doesn't
- No free plan; the Monthly plan costs $49 per month
- Monthly plan supports up to five controller connections
- Automatic runs require a connection to a supported controller
RainRule fact sheet, pricing and score →
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
Last updated · How we research and update