The Tonic 23 is a French trailerable sailboat, that was designed by Philippe Harlé as a coastal cruiser and first built in 1985.

[1][2][9][10] The Tonic 23 is a recreational keelboat, built predominantly of monolithic polyester fiberglass, with wood trim.

It has a fractional sloop rig with a deck-stepped aluminium mast with a single set of swept-back spreaders, a raked stem, a vertical transom, a transom-hung rudder controlled by tiller and a fixed fin keel or optionally a stub keel and centerboard.

The design has a hull speed of 6.04 kn (11.19 km/h) and the fresh water tank has a capacity of 5.3 U.S. gallons (20 L; 4.4 imp gal)[1][2][3][8] The design has sleeping accommodation for four people, with a double "V"-berth in the bow cabin, with a drop-down dinette table and an aft cabin with a double berth on the port side.

Worst features: The Tonic’s iron keel will require regular maintenance to keep from weeping rust.