QField is the leading GIS data collection app.
It integrates perfectly with QGIS.

Features

1. Efficient field work

• Touch optimized, simple user interface
• Fully QGIS compatible
• Highly configurable data entry forms
• Adaptable to any data model
• Capture pictures to illustrate the data
• External GNSS antenna integration through bluetooth
• Store accuracy information alongside recorded points for Q/A
• Print to mobile printers or PDF

2. Flexible and powerful spatial data management

• Supports raster, vector, mesh, and point cloud data in a range of
  industry-standard formats
  • Raster formats include: GeoPackage, GeoTIFF, GRASS, ArcInfo binary and ASCII grids, ERDAS Imagine SDTS, WMS, WCS, PostgreSQL/PostGIS, and other GDAL supported formats.
  • Vector formats include: GeoPackage, ESRI Shapefiles, GRASS, SpatiaLite, PostgreSQL/PostGIS, WFS, Vector Tiles and other OGR supported formats.
  • Point-cloud format: LAS/LAZ and EPT datasets.
• Access and display local files, spatial databases (PostGIS, SpatiaLite), web services (WMS, WCS, WFS, ArcGIS REST
  services), tile services, etc.
• Visual and numerical digitizing and editing
• On-the-fly reprojection between coordinate reference systems (CRS)
• Temporal support

3. Beautiful cartography

• Large variety of rendering options
• Fine control over symbology, labeling, legends and additional graphical
  elements for beautifully rendered maps
• Advanced styling using data-defined overrides, blending modes, and draw
  effects
• Create and update maps with specified scale, extent, style, and
  decorations via saved layouts
• Generate multiple maps (and reports) automatically using QGIS Atlas and
  QGIS Reports
• Flexible output direct to printer, or as image (raster), PDF, or SVG for
  further customization
• On-the-fly rendering enhancements using geometry generators (e.g. create
  and style new geometries from existing features)

4. Collaborative work

• Collaboratively work on datasets through QFieldCloud